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Effect of Processing on the Sintering of High Dielectric constant CaCu 3 Ti 4 O 12 Ceramics
Author(s) -
Leret Pilar,
de la Rubia Miguel A.,
RubioMarcos Fernando,
Romero Juan José,
Fernández José Francisco
Publication year - 2011
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2010.02565.x
Subject(s) - materials science , calcination , ceramic , sintering , dielectric , raman spectroscopy , microstructure , raw material , stoichiometry , phase (matter) , chemical engineering , composite material , chemistry , optoelectronics , biochemistry , physics , organic chemistry , optics , engineering , catalysis
In this work, two series of ceramic CaCu 3 Ti 4 O 12 (CCTO) have been prepared by a solid‐state reaction, studying the effect of an extra calcination and milling step of the raw materials in one of the products. The comparison of the green powder characteristics, microstructure, and electrical properties of the sintered materials is presented and discussed. The double calcination route diminishes the amount of unreacted CuO, and thus, a thinner secondary phase ≤10 nm is better distributed among the grain boundaries enhancing the giant dielectric response. Raman spectroscopy confirms the reduction of unreacted copper, indicating the relation of the Ag (1)/Ag (2) vibrational modes that the stoichiometry of the precursors approaches that of the ideal ceramic CCTO.